component

1SMB5938BT3G

Public Made by Adom

by adom

onsemi Zener Diodes, SMB. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.

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1SMB5938BT3G

onsemi · Zener Diodes · SMB

1SMB5938BT3G from onsemi, in a SMB. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 K passive Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint.
2 A passive Anode.

Key specifications

Parameter Value
Manufacturer onsemi
Package SMB
Category Diodes
Pins 2

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Zener voltage tolerance (B suffix, 5%) -5 5 % Type number suffix B; Note 2 states 5% tolerance 3
Reverse Zener Voltage VZ 34.2 36 37.8 V @ IZT = 10.4 mA; TL = 30°C; nominal measured at 25°C junction (Note 3) 3
Maximum Zener Impedance ZZT 38 Ω @ IZT = 10.4 mA, IZ(ac) = 0.1 IZ(dc), 60 Hz 3
Maximum Zener Impedance ZZK 850 Ω @ IZK = 0.25 mA, IZ(ac) = 0.1 IZ(dc), 60 Hz 3
Reverse Leakage Current IR 1 µA @ VR = 27.4 V 3
Maximum DC Zener Current IZM 41 mA 3
Forward Voltage VF 1.5 V @ IF = 200 mA dc, for all types 3
Maximum Steady State Power Dissipation PD 3 W @ TL = 75°C, measured at zero lead length; derate 25 mW/°C above 75°C 1
Maximum Steady State Power Dissipation PD 550 mW @ TA = 25°C (Note 1, FR-4 board, recommended footprint); derate 4.4 mW/°C above 25°C 1
Thermal Resistance, Junction-to-Lead RθJL 40 °C/W Measured at zero lead length 1
Thermal Resistance, Junction-to-Ambient RθJA 226 °C/W FR-4 board, recommended footprint (Note 1) 1
Operating and Storage Temperature Range TJ, Tstg -65 150 °C 1

CAD (KiCad official)

  • Symbol: 1SMB5938BT3G
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB (KiCad packages3D, STEP)
  • 3D model files: 1smb5938bt3g-etched.step / 1smb5938bt3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1smb5938bt3g.step / 1smb5938bt3g.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: onsemi datasheet (6 pp, sha256 52985d4757f03142, retrieved 2026-10-21, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary cathode-band convention (convention), consensus off (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF